Free Access

Fig. 1


Colour − colour diagram (YK vs. JK) for the stars from a combined UKIDSS/2MASS catalogue (top panel) and for the 2MASS stars of the MRC 1017-220 field (bottom panel), shown as an example for the calibration of the Y-band HAWK-I data. Stars are well fitted by an empirical colour − colour relation, (YK)Vega = 1.45 × (JK)Vega (solid line). The standard deviation (0.07) of the distribution is shown by the dotted lines.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.